Finding the Fourth Proportional to 2,072.25, 3,108.47 and 611.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.25 : 3,108.47 = 611.53 : x
2. Step 2: Convert to fraction form
   2,072.25/3,108.47 = 611.53/x
3. Step 3: Cross multiply
   2,072.25x = 3,108.47 × 611.53
4. Step 4: Simplify right side
   2,072.25x = 1,900,911.83
5. Step 5: Solve for x
   x = 1,900,911.83/2,072.25
6. Step 6: Final answer
   x = 917.32